text: # Copyright (c) 2002-2012 IronPort Systems and Cisco Systems
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  #
  # ssh.cipher.des3_cbc
  #
  # Implements the Triple DES cipher in CBC mode.
  #
  
  __version__ = '$Revision: #1 $'
  
  from coro.ssh.cipher import SSH_Cipher_Method
  from Crypto.Cipher import DES3
  
  class Triple_DES_CBC(SSH_Cipher_Method):
  
      name = '3des-cbc'
      block_size = 8
      key_size = 24
      iv_size = 8
      cipher = None
  
      def encrypt(self, data):
          return self.cipher.encrypt(data)
  
      def decrypt(self, data):
          return self.cipher.decrypt(data)
  
      def set_encryption_key_and_iv(self, key, IV):
          self.key = key
          self.IV = IV
          self.cipher = DES3.new(key, DES3.MODE_CBC, IV)
  